1, change to another 48V12AH about the car to try the charger 2, borrow a 48V10~14AH charger to change to the car to try the car battery results are very obvious. But it has been green, there are chargers and batteries are not bad, but the charger jack and the car's charging interface is in poor contact, resulting in short circuit, which is equivalent to no load, so the green light. The jack about your reaction is 0.01V voltage, this is now a function of some chargers called no-load 0 output: do not plug the battery, measure the output, the voltage is close to 0.
This reason is no more than 1, the battery aging, just start a charge, is the normal reaction indication, but can not rush into the electricity, will immediately stop working, turn green, fan stop, 2, may be the connection line is not done, mainly plug, socket connection is poor resulting in not charging, \"according to your description, this possibility is small\